1. Support or endorsement given with little enthusiasm, commitment, or conviction
The project received only half-hearted backing from the board of directors.
O projeto recebeu apenas apoio sem entusiasmo dos membros da diretoria.
2. Tepid or lukewarm support that lacks genuine passion or full commitment
His half-hearted backing of the proposal made it clear he had reservations.
Seu apoio sem entusiasmo à proposta deixou claro que ele tinha reservas.